tetrasodium 2-[[4-chloro-6-[[3-[[4,5-dihydro-3-methyl-5-oxo-1-(4-sulphonatophenyl)-1H-pyrazol-4-yl]azo]-4-sulphonatophenyl]amino]-1,3,5-triazin-2-yl]amino]benzene-1,4-disulphonate

2-[[4-Chloro-6-[[3-[[[4,5-dihydro-3-methyl-5-oxo-1-(4-sodiooxysulfonylphenyl)-1H-pyrazol]-4-yl]azo]-4-sodiooxysulfonylphenyl]amino]-1,3,5-triazin-2-yl]amino]-1,4-benzenedisulfonic acid disodium salt